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+
+
+
+Simplest possible product
+- one field: 2 metre temperature
+- all models that output param=2t would work
+- may also have a lead time range specified from
+
+So we could say "here are all the models with param=2t with lead times in the specified interval"
+
+quantiles
+  param: 
+  float range from 0 - 100
+
+threshold:
+  "give me 2 metre temperature values that are above this threshold"
+
+
+  product requrements can be specified as a set of:
+    params: one or more params
+    levels: one or more or all 
+    time: 
+      - product could be specific to a particular time
+      - could require at least a months worth of data